I see that u said u "used" weight gainers and so forth. U will need to use them consistantly. In my mind anybody who is considering AS will do so regardless of what others say. As for natural growth its a matter of calories in and calories burned. If ur not eating enough quality calories u wont grow, no matter how much u think ur eating. U also might being over training too. I have seen that a lot in hard gainers. AS may seem amazing but there is no such thing as anything being 100% safe. As i dont know much about ur training routine i cant give advice there. But as for the AS nothing is a miracle and they all have their downsides, especially the main mass builders.